Image display device and method of driving the same

Abstract

Discussed is a method of driving an image display device including a plurality of pixel circuits having respective light emitting elements and arranged in a plane in a first direction and in a second direction different from the first direction; and a plurality of power source lines each connected in common to each column of pixel circuits which comprises the pixel circuits arranged in the first direction comprises (a) deriving a voltage drop expected to be generated in one power source line based on the wiring resistance of the one power source line and first image data supplied to a plurality of pixel circuits connected in common to the one power source line; (b) deriving second image data by correcting the first image data based on the voltage drop; and (c) causing the light emitting elements to emit light based on the second image data.

The invention claimed is: 
     
       1. A method of driving an image display device including a plurality of pixel circuits each having a light emitting element; a power source line connected in common to the plurality of pixel circuits, supplying a current from one end side toward an opposite end side of a light emission region in which the plurality of pixel circuits are arranged; and an image signal line for applying a potential corresponding to image data to the plurality of pixel circuits, the method comprising:
 a deriving step of deriving a second correction value based on a first correction value derived from tone data of the plurality of pixel circuits included in a first light emission region extending halfway from the opposite end side to the one end side of the light emission region, a resistance of the power source line, and tone data of the plurality of pixel circuits included in a second light emission region arranged closer to the one end side than the first light emission region; 
 an adjusting step of adjusting a tone indicated by the image data based on the second correction value; 
 a setting step of setting a potential of the plurality of pixel circuits arranged in the second light emission region or a potential of the plurality of pixel circuits arranged closer to the one end side than the second light emission region by applying a potential corresponding to the tone adjusted in the adjusting step to the image signal line; and 
 a light emission step of causing each of the light emitting elements to emit light by supplying a current from the power source line to each of the light emitting elements, 
 wherein the first light emission region is an N th  light emission region (N is a natural number) extending halfway from the opposite end side to the one end side of the light emission region and the second light emission region is an (N+1) th  light emission region arranged closer to the one end side than the N th  light emission region, and 
 the first correction value is N th  correction value derived from tone data of the plurality of pixel circuits that are included in the N th  light emission region and the second correction value is (N+1) th  correction value derived based on the N th  correction value, the resistance of the power source line, and tone data of the plurality of pixel circuits included in the (N+1) th  light emission region. 
 
     
     
       2. The method of driving an image display device according to  claim 1 , wherein the first and second light emission regions are adjacent to each other and each constituted by pixel circuits arranged in a line of the plurality of pixel circuits. 
     
     
       3. The method of driving an image display device according to  claim 1 , wherein in the deriving step, the second correction value is derived based on the first correction value, the resistance of the power source line, and tone data of a part of pixel circuits included in the second light emission region. 
     
     
       4. The method of driving an image display device according to  claim 1 , wherein each of the pixel circuits includes a driving transistor having a first electrode, a second electrode and a third electrode, and the driving transistor adjusts a current flowing between the first electrode and the second electrode by a potential applied to the third electrode,
 the second electrode is electrically connected to the light emitting element, and a current flowing between the first electrode and the second electrode is adjusted to control a current flowing in the light emitting element, and 
 in the light emission step, a potential applied to the third electrode is adjusted in response to a correction value derived from tone data of the plurality of pixel circuits arranged throughout the light emission region. 
 
     
     
       5. The method of driving an image display device according to  claim 4 , wherein in the light emission step, a potential applied to the image signal line is increased in response to a correction value derived from tone data of the plurality of pixel circuits arranged throughout the light emission region to increase a potential applied to the third electrode. 
     
     
       6. The method of driving an image display device according to  claim 4 , wherein the power source line is electrically connected to the first electrode, and in the light emission step, a potential applied to the power source line is increased in response to a correction value derived from tone data of the plurality of pixel circuits arranged throughout the light emission region to increase a potential applied to the third electrode. 
     
     
       7. An image display device, comprising:
 a plurality of pixel circuits each having a light emitting element; 
 a power source line connected in common to the plurality of pixel circuits, and supplying a current from one end side toward an opposite end side of a light emission region in which the plurality of pixel circuits are arranged; 
 an image signal line for applying a potential corresponding to image data to the plurality of pixel circuits; 
 a calculation part for deriving a second correction value based on a first correction value derived from tone data of the plurality of pixel circuits included in a first light emission region extending halfway from the opposite end side to the one end side of the light emission region, a resistance of the power source line, and tone data of the plurality of pixel circuits included in a second light emission region arranged closer to the one end side than the first light emission region; 
 an adjustment part for adjusting a tone indicated by the image data based on the second correction value; 
 a potential application part for setting a potential of the plurality of pixel circuits arranged in the second light emission region or a potential of the plurality of pixel circuits arranged closer to the one end side than the second light emission region by applying a potential corresponding to the tone adjusted by the adjustment part to the image signal line; and 
 a control part for causing each of the light emitting elements to emit light by supplying a current from the power source line to each of the light emitting elements, 
 wherein the first light emission region is an N th  light emission region (N is a natural number) extending halfway from the opposite end side to the one end side of the light emission region and the second light emission region is an (N+1) th  light emission region arranged closer to the one end side than the N th  light emission region, and 
 the first correction value is N th  correction value derived from tone data of the plurality of pixel circuits that are included in the N th  light emission region and the second correction value is (N+1) th  correction value derived based on the N th  correction value, the resistance of the power source line, and tone data of the plurality of pixel circuits included in the (N+1) th  light emission region.